What are the effects of El Niño?

El Niño Southern Oscillation is not some little isolated event in the
Pacific Ocean. Through teleconnections, which are defined as atmospheric
interactions between widely separated regions, it can indirectly and directly
have an impact around the world. El Niño
has a cold counterpart called
La Niña,
and these events are part of the El Niño
Southern Oscillation

To see some of the impacted areas in detail; click on the regions on the image map.